Changing or adding a vanity light in your bathroom will brighten things up. Vanity lights come in many styles and sizes, such as strip, sconce, bar and single vanity lights. All will fit over an existing electrical box and are easy to install if the wires are already there. Measure the area before choosing a new vanity light and be sure the light will fit. Choose a light fixture to create a strong illumination that is still easy on the eyes. Halogen light bulbs and a frosted globe will create a shadowless environment.